package Servlets;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet permettant de deconnecter un utilisateur
 * @author AZRIA Nouriel
 */
@WebServlet(name = "ServletDeconnexion", urlPatterns = {"/deconnexionUser"})
public class ServletDeconnexion extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        
        // Pratique pour décider de l'action à faire   
        String action = request.getParameter("action");  
        String forwardTo = "";  
        String message = "";  
        
        // Traiter les cas recus
        if (action != null) {  
            
            // --- Traiter la demande de deconnexion de l'utilisateur
            if (action.equals("deconnecterUnUtilisateur")) { 
                
                // Detruire la session actuelle
                request.getSession().invalidate();
                
                // Rediriger vers la page de la connexion
                forwardTo = "index.jsp?action=todo"; 
                message = "Vous avez été deconnecté."; 
                
            }
            else{
                forwardTo = "index.jsp?action=todo"; 
                message = "La fonctionnalité pour le paramètre " + action + " est à implémenter !"; 
            }
            
        }
        
        // Aller à la page suivante
        RequestDispatcher dp = request.getRequestDispatcher(forwardTo + "&message=" + message);  
        dp.forward(request, response); 
        
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>

}
